Alopecia Explained: Types, Causes, and What to Expect

"Alopecia" is not a single condition. It is a medical umbrella term that simply means hair loss -- from the Greek word for mange in foxes, if you are curious about etymology. Under that umbrella are dozens of distinct conditions with different causes, patterns, and prognoses. Knowing which type you are dealing with changes everything about what to expect and what options exist.

The Main Types of Alopecia

Type	Cause	Pattern	Reversible?
Androgenic alopecia	Hormonal / genetic	Gradual recession or thinning at crown	Manageable, rarely fully reversed
Alopecia areata	Autoimmune	Patchy, circular bald spots	Often yes, unpredictably
Traction alopecia	Physical stress on follicles	Hairline, temples, edges	Yes, if caught early
Frontal fibrosing alopecia	Inflammatory / immune	Receding hairline, often post-menopause	Partially, with treatment
Cicatricial (scarring) alopecia	Inflammation destroys follicles	Patchy, may have redness or scale	Generally no
Telogen effluvium	Physical/emotional stress	Diffuse, all-over thinning	Usually yes

Androgenic Alopecia: The Most Common Type

Androgenic alopecia -- also called male-pattern or female-pattern hair loss -- affects an estimated 50 percent of men over 50 and up to 40 percent of women at some point in their lives. Despite the name, it is not purely about testosterone. It is about how genetically sensitive certain follicles are to dihydrotestosterone (DHT), a hormone derived from testosterone.

In people with androgenic alopecia, DHT gradually miniaturises susceptible follicles over years. Hairs become finer and shorter with each growth cycle until the follicle eventually stops producing visible hair.

In men, this typically follows the Norwood scale -- recession at the temples and crown that can eventually merge. In women, it more commonly presents as a widening part or overall thinning at the crown, usually without a fully receding hairline.

Minoxidil (topical, applied to the scalp) and finasteride (oral, for men; also used off-label in women) are the most established treatments. Both slow progression and can promote some regrowth with continued use. They require long-term commitment -- stopping treatment typically leads to resumed loss.

Alopecia Areata: The Autoimmune Type

Alopecia areata affects roughly 2 percent of the global population at some point in their lives. It can occur at any age and in any gender. It is an autoimmune condition in which T cells of the immune system mistakenly attack hair follicles, pushing them into a dormant state.

The hallmark of alopecia areata is smooth, round or oval patches of hair loss on the scalp -- sometimes the beard, eyebrows, or other body hair. The skin within the patch usually looks completely normal. The follicles are not destroyed; they are dormant. This is why spontaneous regrowth -- sometimes complete -- can happen.

"The follicles in alopecia areata are alive but silent. The immune response has essentially put them on pause."

The unpredictability of alopecia areata is one of its most difficult aspects. Hair may regrow completely in one patch, then new patches may appear elsewhere. Some people have isolated episodes and never relapse. Others experience chronic, recurrent episodes throughout their lives.

Alopecia totalis refers to complete scalp hair loss. Alopecia universalis is total loss of all body hair, including eyebrows and eyelashes. These are severe forms of the same autoimmune process.

What Treatments Exist for Alopecia Areata?

Treatment options have expanded in recent years. All require medical supervision:

Corticosteroids. Injections of corticosteroids directly into affected patches are a common first-line treatment. They suppress the local immune response. Topical corticosteroids are also used, particularly for children or sensitive areas.

Minoxidil. Does not address the autoimmune cause, but can help regrowth once the immune attack has settled. Often used alongside other treatments.

JAK inhibitors. The most significant development in alopecia areata treatment in decades. Ruxolitinib cream (brand name Opzelura) was approved by the FDA in 2022 specifically for alopecia areata in adults -- the first drug approved for this indication. Oral JAK inhibitors (baricitinib) are also approved. They work by blocking the signalling pathway the immune system uses to attack follicles. Clinical trials showed meaningful hair regrowth in a significant proportion of patients with moderate to severe alopecia areata.

Contact immunotherapy (DPCP/SADBE). A specialised treatment done in dermatology clinics that deliberately provokes a mild allergic reaction on the scalp to redirect the immune response away from follicles. Can be effective for extensive alopecia areata.

Traction Alopecia

Traction alopecia is caused by prolonged physical tension on the hair follicle -- from tight ponytails, braids, extensions, weaves, or other styles that pull the hair over extended periods. It typically presents as hair loss along the hairline and temples.

Caught early, before follicle scarring occurs, traction alopecia can be fully reversed by eliminating the tension. Caught late, once scarring has taken place, loss in the affected area may be permanent. This is why early recognition matters.

The Emotional Dimension

Hair loss at any scale is not just a cosmetic issue. Studies consistently show that hair loss -- particularly sudden or patchy loss -- is associated with significant psychological distress, including anxiety, depression, and reduced quality of life. This is true for people of all genders.

Frequently Asked Questions